首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Unless we spend money to spot and prevent asteroids(小行星)now.one might crash into Earth and destroy life as we know it,say some s
Unless we spend money to spot and prevent asteroids(小行星)now.one might crash into Earth and destroy life as we know it,say some s
admin
2015-01-09
27
问题
Unless we spend money to spot and prevent asteroids(小行星)now.one might crash into Earth and destroy life as we know it,say some scientists.
Asteroids are bigger versions of the meteoroids(流星)that race across the night sky. Most orbit the sun far from Earth and don’t threaten us. But there are also thousands whose orbits put them on a collision course with Earth.
Buy $ 40 million worth of new telescopes right now. Then spend $ 10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one,the scientists say.we’ll have a way to change its course.
Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn’t be cheap.
Is it worth it? Two things experts consider when judging any risk are: 1. How likely the event is; and 2. How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 400,000 years. Sounds pretty rare-but if one did fall.it would be the end of the world. "If we don’t take care of these big asteroids,they’II take care of us,"says one scientist. "It’s that simple."
The cure,though,might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth? "The world has less to fear from doomsday(毁灭性的)rocks than from a great nuclear fleet set against them," said a New York Times article.
What does the passage say about asteroids and meteoroids?
选项
A、They are heavenly bodies different in composition.
B、They are heavenly bodies similar in nature.
C、There are more asteroids than meteoroids.
D、Asteroids are more mysterious than meteoroids.
答案
B
解析
依据文章第二段第一行可以判断出两者性质相似只是体积不同,排除A项;文中并无两者数量上的比较,排除C项;也没有涉及D项的内容。
转载请注明原文地址:https://kaotiyun.com/show/reQO777K
0
考博英语
相关试题推荐
Theenergycrisis,whichisbeingfeltaroundtheworld,hasdramatizedhowthecarelessuseoftheearth’sresourceshasbrough
Theenergycrisis,whichisbeingfeltaroundtheworld,hasdramatizedhowthecarelessuseoftheearth’sresourceshasbrough
Earlyinthesixteenthcentury,FrancisBaconproposedthatscienceconsistedintheelevationoftheauthorityofexperimentan
TheEnglishmanhasbeencalledapoliticalanimal,andhevalueswhatispoliticalandpracticalsomuchthatideaseasilybecom
Hereisagreatironyof21st-centuryglobalpublichealth;Whilemanyhundredsofmillionsofpeoplelackadequatefoodasare
I’msorryI’mlate.Ihadamental______andforgetthatwewouldhaveameetingtoday.
Historywillalways______anyintendedrouteandtakeanunforeseenoneinstead.
Eversinceitsdiscovery,Plutohasneverreallyfittedin.AfterthepaleandglowinggiantNeptune,itislittlemorethanac
CrossingWesleyanUniversity’scampususuallyrequireswalkingovercolorfulmessageschalkedontheground.Theycanbeasinno
In1993,NewYorkStateorderedstorestochargeadepositonbeverage(饮料)containers.Withinayear,consumershadreturnedmill
随机试题
甲市A铅锌矿有限责任公司现有职工304人,其中专业技术人员21人,专职安全管理人员7人,兼职安全员46人,特种作业人员56人。矿山现有25m、-20m、-70m、-120m四个中段,其中20m、-70m、-120m是生产中段。矿山现有5个斜井,其中1号斜井
Borrowingtostartabusinessisnoteasy.Gettingabankloan,particularlyforanewsmallbusiness,islikegoingthroughthe
在哲学史中我们可以看到,各种唯心主义派别之间的差异和矛盾,常常有利于唯物主义的发展,这一事实说明()
关于胸大肌的描述,正确的是
下列属于栓剂油脂性基质的是
招标与评标程序中,表述错误的为()。
设计目标层次时,一天的培训不要超过()个目标。
邓小平同志指出:“解决民族问题,中国采取的不是民族共和国联邦的制度,而是民族区域自治的制度。我们认为这个制度比较好,适合中国的情况。”我国实行民族区域自治的历史依据是()。
WhatdowelearnfromtheconversationaboutMissRowling’sfirstbook?
Inthispartofthetestyouaregivenadiscussiontopic.Youhave30secondstolookatthepromptcard,anexampleofwhich
最新回复
(
0
)